1 /* ===-- subvdi3.c - Implement __subvdi3 -----------------------------------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is dual licensed under the MIT and the University of Illinois Open 6 * Source Licenses. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file implements __subvdi3 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 17 /* Returns: a - b */ 18 19 /* Effects: aborts if a - b overflows */ 20 21 COMPILER_RT_ABI di_int 22 __subvdi3(di_int a, di_int b) 23 { 24 di_int s = (du_int) a - (du_int) b; 25 if (b >= 0) 26 { 27 if (s > a) 28 compilerrt_abort(); 29 } 30 else 31 { 32 if (s <= a) 33 compilerrt_abort(); 34 } 35 return s; 36 } 37
